#include #include using namespace std;

int main() {

double price;
cin >> price;

double cost = 0.0;

// write your code here.......
price>=5000?cost = price*0.6:(price>=2000?cost = price*0.7:(price>=500?cost = price*0.8:(price>=100?cost = price *0.9:cost = price)));
cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;

return 0;

}